Tire failure. Again

[joeg]

not on a Hankook; saw one a couple weeks ago on a BFG tire.

[Terry Hanushek]

Joe

not on a Hankook; saw one a couple weeks ago on a BFG tire.

From above: Tires are 2 year old Toyo RA1s at 42psi hot,

T

[Chip42]

One of our MR2s had a similar failure at Roebling back in July - Hankook DOTR (C71?). it happens - banging curbs and stuff makes it more likely - it's often the result of a trauma to the tire that shows a long time later. your hot pressures seemed a little high, that isn't going to help it either. too-low pressures would have different but similarly bad failure modes.

[backformore]

Toyo recommends hi 30 to low 40 hot pressures. My old data shows we ran 37-38 on the Miatas. I figured with the high loads of front tires on the Civic they would like even more on the high side.

Any thoughts? Anyone running RA1 on Honda with different numbers?

Didn't have opportunity to get tire temps. Really wish I had now.

[mossaidis]

on my 2300 lbs Civic EG, I would run toyo's between 37-39 hot. That was back in 2006-09.

[madrabbit15]

42lbs Hot "might" be okay on the front of a FWD car, but it certainly would not be anywhere close to fast or optimal. I wouldn't trust it. You don't want to see any more than 37-38 lbs hot on any tire, toyo, kumho, hoosier. Some of the manufacturers are more forgiving than others so you might be able to get away with it but doesn't mean you should.

[Flyinglizard]

42 is not out of range. Check for at least 1 in of clearance between the tie rod end /strut etc for rubs.
1in may seem like a lot but I now paint(chevy orange) the outer ends of my suspension.( to watch for rubs. )

[ShelbyRacer]

Hankooks had tread separation instances when they were run counter-recommended-rotation.

Had the Toyos ever experienced extreme cold during their life (As in less than 15*F)?

[mossaidis]

The thread also reminded me that I had a toyo seperate from the bead once. Front left at Limerock going down the straight away after a day of dual driving. It was 1 of 20 Toyos where I didn't have any issues with them.

42lbs Hot "might" be okay on the front of a FWD car, but it certainly would not be anywhere close to fast or optimal. I wouldn't trust it. You don't want to see any more than 37-38 lbs hot on any tire, toyo, kumho, hoosier. Some of the manufacturers are more forgiving than others so you might be able to get away with it but doesn't mean you should.

My fastest times on my FWD Honda Civic with a 225/45R15 at 2290 lbs is 40 lbs hot with Hoosiers. You might not trust it, but the timing clock has different intentions and my placement says otherwise. Much about pressures has also to do with car setup as well.

[Simon T.]

Were you running Chin?

[backformore]

I sure was Simon. Black Civic Si in the blue group when I was not instructing. Seems like I remember you name on the entry list. I assume you were there too?

A little further investigation also reveals that the tires were on the overinflated side, although still seemingly withing Toyos advised values. Also, there was some scuffing on the inner sidewall that reminded me I ALMOST went over the back of the curbing at turn 10A earlier in the weekend, which, if you are familiar with it, is a BIG drop off. So it's possible that the combination led to the failure.

The biggest curiosity is that I had the same failure with a different tire when the car was configured completely differently. Things that make you go Hmmmmm.